What key disadvantage is associated with a carbureted motor?

The key disadvantage associated with a carbureted motor is that it is not responsive to atmospheric changes. Carburetors operate based on a fixed design that mixes air and fuel in a set ratio. This means they do not automatically adjust for variations in air density that occur with changes in altitude, temperature, or humidity. This lack of adaptability can lead to suboptimal performance in varying conditions, resulting in either a too-rich or too-lean fuel mixture, which can affect engine efficiency and power output.

In contrast, modern fuel injection systems have sensors that detect changes in atmospheric conditions and adjust the fuel mixture accordingly, providing better performance and efficiency across a range of environments. This responsiveness to atmospheric changes is a significant advantage of fuel injection technology over carburation.